Carburetor



chamber.

Nnsco, a subject of the King I of the form illustrated.

Patented Jan. 5, 1926.

UNITED STATES ononen cons'ranrmnsco, or wnxnnrnen, ENGLAND.

- cannunn'ron.

Application filed I'ebruary 7, 1922. Serial No. 534,749.

To all whom it may concern:

Be it known that I. GEORGE CONSTANTI- of Great Britain and Ireland, residing at Carmen Sylva, Beechwood Avenue, Oatlands- Pa1-k,..Weybridge, in the county of Surrey, England, have invented certain new and useful Improvementsin Carburetors, of which the following is a specification.

The invention consists in improvements relating to carburetors having an inverted or down flow fuel supply nozzle, and it consists in disposing the outlet in relation to the throttle and in shielding the outlet so that while the incoming fluid is introduced into the main body of the air current, it is at the same time shielded from the direct action of the current and subject only to the suction inthe air passage.

In the accompanying drawings, Figure 1 is a cross section, and Figure 2 a longitudinal section through a carburetor. Fig. 3 is an elevation of the conical hood showing the fuel outlet.

The drawings show by way of example a suitable down flow carburetor, but no claim is made for its special features, as the invention is applicable to any. carburetor of this t e.

yg is the float chamber and b the mixing Screwed into the bottom of the float chamber is a partition 0 projecting above thelevel of the fuel in the float chamber when the engine is 'not running. Projecting downwards from the center of the cover d of the float chamber is a'partition e. The nozzle 9' is screwed into the lower end of a central rod h which is screwed into the partition 0, the passages 11 for petrol to pass to the nozzle being formed in the lower end of the rod h. The float consists of a cork attached to the free end of a hinged member The vertical portion of the arm Z near the hinge m is ar' ranged to bear against the" needle Valve a controlling the flow of petrol into, the float chamber. At one side of the float chamber there is provided a passage 0 leading through a restriction p from the induction pipe 6 to the interior of the sleeve e. A disk valve fore it reaches the fuel, thus q controls a passage leading from the main space within the float chamber into the pas sage 0 to limit the suction effect which can be obtained insidethe sleeve e. A slotted plug t is provided to control the flow of air into the float chamber. According to my invention the axis of the throttle is placed immediately below the nozzle g, and surrounding the nozzle is an inverted conical hood or baflle u; The baffle extends downwardly as nearly as possible to the throttle axis, and is pointed so as not to interfere with the throttle. It has perforations c on the side towards the air-inlet and a slot w on the other side. The access 66 of the air on the inlet side to the interior of the nozzle is therefore 'somewhat'restricted, and this restriction on the inlet side and vfreedom of outlet on the other side pre' vent the vertical component of the air cur- 70 rent from interfering with the flow through the nozzle when the throttle is nearly closed. The reasons for locating the throttle axis immediately under the nozzle are two. In the first place the fuel can be introduced into 7 the middle of the air current at or near'the place Where the throttling is greatest and where therefore changes in velocity and herefore in suction have their greatest of ect. be used for restricting the air supply befacilitating starting in cold weather and avoiding the necessity of resorting to other means for restricting the air inlet, such, for instance, as the common practice of the introduction of'a rag. l

What I claim is In a down flow carburetor, a mixing chamber into which the fuel is discharged through an orifice, a throttle turning about a horizontal axis arranged vertically below said orifice, and 'a conical hood covering said orifice and extending into themixing chamber to a point close to'the axis of the throt- GEORGE CON STAN TINESCO.

Secondly it enables the throttle to so 

